He cums too quickly

Okay, so I just had sex with my man for the first time a few days ago. He went down on me, felt great. I went down on him maybe for 5 minutes, he seemed to enjoy it but I know it wasn't my best work, and not good enough to cum from. So when I start riding him, he lasts maybe 10 thrusts (no joke), pulls out, and cums. I wasn't even in the groove yet and he came.

He got laid a few weeks ago (we aren't official), so I know it isn't because he hasn't had sex in a while.

What can I do to make it better?

The next morning I tried to be more quiet and have him on top (because I know he loves when I'm loud and on top, so I switched it up) but it didn't seem to help.

How do I make it last longer while still being sexy?!

Help!